Salicru CV50-008-4F, Руководство пользователя, Страница: 112 / 144

112 - 144 Communication Protocol
The meaning of the response is that:
ADDR = 01H means the command message is sent to the inverter with the address of 01H and ADDR
occupies one byte
CMD =03H means the message is received from the inverter to the master for the response of reading
command and CMD occupies one byte
“Byte number” means all byte number from the byte (excluding the byte) to CRC byte (excluding the byte). 04
means there are 4 byte of data from the “byte number” to “CRC CHK low bit”, which are “digital address 0004H
high bit”, “digital address 0004H low bit”, “digital address 0005H high bit” and “digital address 0005H low bit”.
There are 2 bytes stored in one data with the fact that the high bit is in the front and the low bit is in the behind
of the message, the data of data address 0004H is 1388H, and the data of data address 0005H is 0000H.
CRC occupies 2 bytes with the fact that the high bit is in the front and the low bit is in the behind.
9.4.1.2 Command code: 06H
06H (correspond to binary 0000 0110), write one word (Word)
The command means that the master write data to the inverter and one command can write one data other
than multiple dates. The effect is to change the working mode of the inverter.
For example, write 5000 (1388H) to 0004H from the inverter with the address of 02H, the frame structure is as below:
RTU master command message (from the master to the inverter)
START T1-T2-T3-T4 (transmission time of 3.5 bytes)
ADDR 02H
CMD 06H
High bit of writing data address 00H
Low bit of writing data address 04H
High bit of data content
13H
Low bit of data content
88H
CRC CHK low bit C5H
CRC CHK high bit 6EH
END T1-T2-T3-T4 (transmission time of 3.5 bytes)
RTU slave response message (from the inverter to the master)
START T1-T2-T3-T4 (transmission time of 3.5 bytes)
ADDR 02H
CMD 06H
High bit of writing data address 00H
Low bit of writing data address 04H
High bit of data content
13H
Low bit of data content
88H
CRC CHK low bit C5H
CRC CHK high bit 6EH
END T1-T2-T3-T4 (transmission time of 3.5 bytes)
9.4.1.3 Command code 08H for diagnosis
Meaning of sub-function codes
Sub-function Code Description
0000 Return to inquire information data
For example: The inquiry information string is same as the response information string when the loop
detection to address 01H of driver is carried out.